WO2018207717A1

WO2018207717A1 - Joint structure

Info

Publication number: WO2018207717A1
Application number: PCT/JP2018/017582
Authority: WO
Inventors: 和広山形
Original assignee: オリンパス株式会社
Priority date: 2017-05-08
Filing date: 2018-05-07
Publication date: 2018-11-15
Also published as: JP6487961B2; US20200070237A1; JP2018189160A

Abstract

This joint structure (1) is provided with: arms (11, 12); a caulking plate (14) disposed adjacent to the arms (11, 12); and shaft members (15) that couple the arms (11, 12) and the caulking plate (14). The shaft members (15) each have: a body part (151) that is inserted into through-holes (11a, 12a) formed in the respective arms (11, 12), and rotatably supports the arms (11, 12); and a connection part (153) that is inserted into through-holes (14a) formed in the caulking plate (14), and supports the caulking plate (14) in a non-rotatable manner. The inner diameter of a countersunk hole (153a) formed in a tip (153c) of each connection part (153) increases whereby at least a portion of the outer circumferential surface (153b) of the connection part (153) is tightly adhered to the inner circumferential surface (14b) of each through-hole (14a) of the caulking plate (14).

Description

Joint structure

The present invention relates to a joint structure.

As a conventional joint structure, for example, in Patent Document 1, a connecting pin is inserted into end portions of a plurality of link members, and the diameter of the connecting pin protruding from the side surface of the link member is increased by hitting with a hammer or the like. A structure in which a link member is rotatably supported by a connecting pin is disclosed.

Japanese Patent No. 3238638

In the joint structure disclosed in Patent Document 1, since the diameter of the joint pin protruding from the side surface of the link member is struck to increase the diameter, an axial force is applied to the connection pin. For this reason, deformation such as shaft thickening or buckling is likely to occur in the connecting pin, and operation failure (rotation failure) may occur in the link member. Further, the joint structure disclosed in Patent Document 1 has been an obstacle to miniaturization because the tip of the connection pin protrudes from the side surface of the link member even after the tip of the connection pin has been enlarged.

The present invention has been made in view of the above, and an object of the present invention is to provide a joint structure that does not cause malfunction and is suitable for downsizing.

In order to solve the above-described problems and achieve the object, the joint structure according to the present invention includes a movable member, a fixed member disposed adjacent to the movable member, the movable member, and the fixed member. A shaft member to be coupled, wherein the shaft member is inserted into a through-hole formed in the movable member, and a main body that rotatably supports the movable member; and the fixed member A joint portion that is inserted through the formed through-hole and supports the fixed member in a non-rotatable manner, and the inside diameter of the counterbore hole formed at the tip of the joint portion is expanded, At least a part of the outer peripheral surface of the joint is in close contact with the inner peripheral surface of the through hole of the fixed member.

Further, in the joint structure according to the present invention, in the above invention, the tip of the joint is at the same height as the open end of the through hole of the fixed member, or inside the open end of the through hole of the fixed member. It is located in.

Further, in the joint structure according to the present invention, in the above invention, the through hole of the fixed member is formed in a tapered shape that is reduced in diameter toward the movable member, and the inner diameter of the counterbore hole is By expanding the diameter, the entire outer peripheral surface of the joint is in close contact with the inner peripheral surface of the through hole of the fixed member.

According to the present invention, the joint portion is fixed to the through hole of the fixed member by increasing the inner diameter of the counterbore hole formed at the tip of the joint portion of the shaft member. For this reason, no force is applied in the axial direction of the shaft member during crimping (or the axial force is very small), so that the shaft member does not deform such as shaft thickening or buckling, and the arm operates well. Can be secured. Further, according to the present invention, since the joint portion is fixed to the through-hole of the fixed member by expanding the counterbore hole, the tip end of the shaft member does not protrude from the side surface of the fixed member, thereby realizing miniaturization. be able to.

FIG. 1 is a cross-sectional view showing a configuration of a joint structure according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a shaft member and a caulking plate before caulking in the joint structure according to the embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view showing a shaft member and a caulking plate after caulking in the joint structure according to the embodiment of the present invention. FIG. 4 is an enlarged cross-sectional view showing a shaft member and a caulking plate before caulking in a modified example of the joint structure according to the embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view showing a shaft member and a caulking plate after crimping in a modified example of the joint structure according to the embodiment of the present invention.

Hereinafter, embodiments of the joint structure according to the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

First, the structure of the joint structure according to the embodiment of the present invention will be described with reference to FIG. The joint structure 1 is used, for example, as a joint of a plurality of link members. As shown in FIG. 1, a plurality (two in this embodiment) of

arms

11 and 12, a fixed plate 13, and a caulking plate 14 and a plurality of (two in this embodiment) shaft members 15.

The arms (movable members) 11 and 12 are formed in a rod shape and are arranged to face each other with a predetermined interval. Through

holes

11a and 12a are formed at the ends of the

arms

11 and 12, respectively, and the main body 151 of the shaft member 15 is inserted through the through

holes

11a and 12a. Thereby, the

arms

11 and 12 can rotate around the shaft member 15 with respect to the fixed plate 13 and the caulking plate 14.

The fixing plate 13 is formed in a plate shape and is disposed adjacent to one side surface of the

arms

11 and 12. The fixed plate 13 includes a plurality of stepped holes 13a (two in the present embodiment) in which a through hole having the same diameter as the through

holes

11a and 12a and a through hole having a diameter larger than the through

holes

11a and 12a are combined. ), And stopper portions 152 of the shaft member 15 are respectively disposed in the stepped holes 13a.

The caulking plate (fixed member) 14 is formed in a plate shape and is disposed adjacent to the other side surface of the

arms

11 and 12. The caulking plate 14 has a plurality of through holes 14a (two in the present embodiment) smaller in diameter than the through

holes

11a and 12a, and the joint portions 153 of the shaft member 15 are inserted into the through holes 14a, respectively. ing. The through hole 14a is formed in a cylindrical shape having a constant inner diameter.

The through

holes

11a and 12a of the

arms

11 and 12, the stepped hole 13a of the fixing plate 13, and the through hole 14a of the caulking plate 14 are formed coaxially and concentrically.

The shaft member (connection pin) 15 connects the

arms

11 and 12 and the caulking plate 14. The shaft member 15 is formed in a rod shape as a whole, and includes a main body portion 151, a stopper portion 152, and a joint portion 153. The main body 151 is formed in a columnar shape. Moreover, the main-body part 151 is penetrated by the through-

holes

11a and 12a of the

arms

11 and 12, and is supporting the said

arms

11 and 12 rotatably.

The stopper part 152 is formed in a dish shape, and is formed to have a larger diameter than the outer diameter of the main body part 151. Moreover, the stopper part 152 is arrange | positioned at the stepped hole 13a of the fixed plate 13, and is latched by the said stepped hole 13a.

The joint portion 153 is formed in a cylindrical shape and has a smaller diameter than the outer diameter of the main body portion 151. Further, the joint portion 153 is inserted into the through hole 14a of the caulking plate 14 and supports the caulking plate 14 so as not to rotate.

A counterbore hole 153a having a predetermined depth is formed at the tip 153c of the joint portion 153. The cross-sectional shape of the counterbore hole 153a is formed in a cylindrical shape having a constant inner diameter before the joint portion 153 is fixed to the through hole 14a of the caulking plate 14 by caulking, which will be described later (see FIG. 2). And the cross-sectional shape of the counterbore hole 153a becomes a taper shape as shown in FIG. 1 by enlarging the internal diameter of the counterbore hole 153a by the crimping process mentioned later.

At least a part of the outer peripheral surface 153 b of the joint portion 153 is in close contact with the inner peripheral surface 14 b of the through hole 14 a of the caulking plate 14. Further, the tip 153c of the joint 153 is located at the same height as the opening end of the through hole 14a of the caulking plate 14, and does not protrude from the opening end of the through hole 14a, in other words, the side surface of the caulking plate 14. .

Hereinafter, a method for fixing the shaft member 15 to the caulking plate 14 in the joint structure 1 (a method for manufacturing the joint structure 1) will be described with reference to FIGS. FIG. 2 shows a state before the shaft member 15 inserted through the arm 11 is fixed to the caulking plate 14. As shown in the figure, before fixing to the caulking plate 14, the counterbore hole 153a of the joint portion 153 of the shaft member 15 has a cylindrical shape with a constant inner diameter, and the inside of the outer peripheral surface 153b of the joint portion 153 and the through hole 14a. A predetermined clearance is formed between the peripheral surface 14b.

In the present embodiment, the inner diameter of the counterbore hole 153a is expanded by caulking the joint 153 of the shaft member 15 with a radial caulking machine (not shown). The radial caulking machine is a device that applies a punch P as shown in FIG. The punch P mounted on the radial caulking machine (not shown) is configured to oscillate within the range of the broken line in FIG. 2 by the rosette-like axial movement, and the axial center of the radial caulking machine (the center of the rosette-like axial movement) Point) and the center of the counterbore hole 153a are aligned.

In this state, when the punch P is swung while being lowered in the axial direction of the shaft member 15, the inner peripheral surface of the counterbore hole 153a is pressed against the side surface of the punch P as shown in FIG. The inner diameter is expanded. As a result, as shown in the figure, a part of the outer peripheral surface 153 b of the joint portion 153 comes into close contact with the inner peripheral surface 14 b of the through hole 14 a of the caulking plate 14, and the shaft member 15 is fixed to the caulking plate 14. 2 and 3 show an example in which the shaft member 15 inserted into the arm 11 is caulked, but the same caulking is also performed on the shaft member 15 inserted into the arm 12. Accordingly, the two shaft members 15 are fixed to the caulking plate 14 and the two

arms

11 and 12 are connected. *

In the joint structure 1 as described above, the joint portion 153 is fixed to the through hole 14a of the caulking plate 14 by increasing the inner diameter of the counterbore hole 153a formed at the tip 153c of the joint portion 153. Therefore, no force is applied in the axial direction of the shaft member 15 during the caulking process (or the axial force is very small), so that the shaft member 15 is not deformed such as shaft thickening or buckling. 12 good operations can be ensured.

Further, in the joint structure 1, since the joint portion 153 is fixed to the through hole 14 a of the caulking plate 14 by expanding the counterbore hole 153 a, the tip 153 c of the shaft member 15 does not protrude from the side surface of the caulking plate 14. It is possible to realize downsizing. For example, in the joint structure disclosed in Patent Document 1, a connecting pin having a length protruding from the side surface of the link member is prepared, and the diameter of the connecting pin is increased by hitting and crushing the tip of the connecting pin. It is difficult to prevent the connecting pin from protruding. On the other hand, in the joint structure 1 according to the present embodiment, as shown in FIG. 2, since the shaft member 15 having a length that does not protrude from the side surface of the caulking plate 14 is used, the tip 153 c of the shaft member 15 is the side surface of the caulking plate 14. It does not protrude from.

(Modification)
In the joint structure 1 described above, the through hole 14a of the caulking plate 14 is formed with a constant inner diameter. However, like the through hole 14Aa of the caulking plate 14A shown in FIG. You may form in the taper shape which is diameter-reduced toward it. That is, the through hole 14 </ b> Aa is formed so that the inner diameter on the arm 11 side is smaller than the inner diameter on the distal end 153 c side of the joint portion 153.

In this case, as shown in FIG. 4, when the punch P of the radial caulking machine is swung down in the axial direction of the shaft member 15 during the caulking process, as shown in FIG. 5, the inner periphery of the counterbore hole 153a The surface is pressed against the side surface of the punch P, and the inner diameter of the counterbore hole 153a is increased. As a result, as shown in the figure, the entire outer peripheral surface 153b of the joint portion 153 is in close contact with the inner peripheral surface 14b of the through hole 14Aa of the caulking plate 14A, and the shaft member 15 is fixed to the caulking plate 14A. In this way, by forming the joint structure 1A using the caulking plate 14A in which the tapered through hole 14Aa is formed, the contact area between the outer peripheral surface 153b of the joint portion 153 and the inner peripheral surface 14b of the through hole 14Aa. Therefore, the fixing strength of the shaft member 15 with respect to the caulking plate 14A is improved.

As described above, the joint structure according to the present invention has been specifically described in the form for carrying out the invention. However, the gist of the present invention is not limited to these descriptions, and is broadly based on the description of the claims. Must be interpreted. Needless to say, various changes and modifications based on these descriptions are also included in the spirit of the present invention.

For example, in the

joint structures

1 and 1A according to the above-described embodiment, the tip 153c of the joint portion 153 is located at the same height as the opening ends of the through holes 14a and 14Aa of the

caulking plates

14 and 14A. The tip 153c of 153 may be located inside the opening ends of the through holes 14a and 14Aa of the

caulking plates

14 and 14A. Also in this case, since the tip 153c of the shaft member 15 does not protrude from the side surfaces of the

caulking plates

14 and 14A, the size can be reduced as compared with the prior art.

In the above-described embodiment, the

joint structures

1 and 1A including the

arms

11 and 12, the fixing plate 13, the

caulking plates

14 and 14A, and the shaft member 15 have been described as an example of the present invention. As long as it includes a fixed member that fixes 15 and a movable member that is rotatably supported by the shaft member 15, the configuration of the

joint structures

1 and 1A is not limited thereto. For example, a joint structure in which only one arm is fixed to the fixed member by the shaft member 15 may be used.

The

joint structures

1 and 1A can be applied to either a large-sized mechanism or a small-sized mechanism, but are applied to a small-sized mechanism including a small-diameter shaft member 15 that easily deforms such as shaft thickening or buckling. By doing so, a greater effect can be obtained.

1,

1A Joint structure

11,12 Arm (movable member)
11a, 12a Through hole 13 Fixing plate 13a Stepped

hole

14, 14A Caulking plate (fixed member)
14a, 14Aa Through hole 14b Inner peripheral surface 15 Shaft member (connection pin)
151 Body portion 152 Stopper portion 153 Joint portion 153a Counterbored hole 153b Outer peripheral surface 153c Tip P P punch

Claims

A joint structure comprising: a movable member; a fixed member disposed adjacent to the movable member; and a shaft member connecting the movable member and the fixed member;
The shaft member is
A body portion that is inserted into a through-hole formed in the movable member and rotatably supports the movable member;
A joint that is inserted through a through-hole formed in the fixed member and supports the fixed member in a non-rotatable manner;
Have
By increasing the inner diameter of the counterbore hole formed at the tip of the joint, at least a part of the outer peripheral surface of the joint is in close contact with the inner peripheral surface of the through hole of the fixed member. A joint structure characterized by that.
The tip of the joint is located at the same height as the opening end of the through hole of the fixed member or inside the opening end of the through hole of the fixed member. The described joint structure.
The through hole of the fixed member is formed in a tapered shape having a reduced diameter toward the movable member side,
2. The entire outer peripheral surface of the joint portion is in close contact with the inner peripheral surface of the through hole of the fixed member by increasing the inner diameter of the counterbore hole. Item 3. The joint structure according to Item 2.